Answer:
c. The overall reaction reduces entropy (products have less entropy than reactants).
Explanation:
The free energy change (delta G) for a reaction must have a negative value to allow the reaction to occur spontaneously. Free energy change depends on entropy (S) and enthalpy (H) of the reaction.
ΔG = ΔH - T ΔS. If a reaction has positive enthalpy change and an overall increase in entropy, the reaction has negative free energy change and occurs spontaneously. However, if a reaction with positive enthalpy change has an overall reduction in entropy, the reaction will have a positive value of free energy change and cannot occur spontaneously.
Answer:
C) Urea
Explanation:
Wohler was a German chemist who was known for his Urea experiment in which he was able to produce organic substance from the inorganic substance.
While he was working on the experiments where he could get cyanide as a product on heating, one day for which he heated the ammonium cyanate (inorganic substance) and got crystals with other physical and chemical properties called urea (organic substance).
Thus, C) Urea is the correct answer.
Answer:
A cold weather front is defined as the changeover region where a cold air mass is replacing a warmer air mass. Cold weather fronts usually move from northwest to southeast. ... Warm fronts usually move from southwest to northeast and the air behind a warm front is warmer and moister than the air ahead of it.
ExplanationThere are four different types of weather fronts: cold fronts, warm fronts, stationary fronts, and occluded fronts. the direction of flow of the air mass and its characteristics. so based on what we know i would say that warm fronts are calmest
